In Acrobat there is a function that makes you able to allow Reader users to enter data in a form, and save it. Its used by going to advanced > Extend features in Adobe Reader.
The form im using is only a template, and this works for that single form only, and since the form im using is only a template the extended features i activate in this way doens't work with the newly created ones created of the template.

I'll explain a bit on what it is that my application is doing.
My application is a webapplication created in .NET 2003 using vb.net and asp.net. The user will on one page fill in a formfield, that will be send to the template once a button is pressed. The form will then load up, with the data posted. Already here i get the error "You cannot save data typed in this form". This error doesnt show up on my developing machine, since i have Acrobat installed, but the others at the office hasn't got it, and they get the error. I can imagine that very few of our customers have Acrobat, so its vital that this will function properly.
Anyway, as the error is shown, i cant type in anything in the form, making it really useless. It has been tested on more than 1 system.

My question is; Can i some how set this properly programmatically in some way?
When i am creating the forms programmatically i'm using ADCpdf, and i've tried with encryption.canFillForms = true, but that didnt work either.

I cannot use LiveCycle for this, sorry. As soon as i have saved using it, the form is unreadable by the application. I've talked to the support about that, and they say that they believe that the form is saved in a "different" format.

LiveCycle Designer and LiveCycle Reader Extensions ES are different products. Reader Extensions ES can reader extend AcroForms, not just XFA forms (XFA forms are the type created with LiveCycle Designer).

LiveCycle is a suite of many products, not just a single product.

> and they say that they believe that the form is saved in a "different" format.

Yes. LiveCycle Designer creates XFA forms and Acrobat creates AcroForms. They are indeed a very different format.

> I'm using Acrobat 9 Pro, but the function is only active in the template, not the form created by the template.

This is correct. Anytime you save changes to a form, the reader extensions are removed and need to be re-enabled. This is by design.

Yes, it is a separate product.
http://www.adobe.com/products/livecycle/readerextensions/

> Or is it included in the same way as LiveCycle Designer was?

No, you have to license it separately. It is a server product that can enable forms through many different methods - via watched folders, webservice, manually, etc.

> Or is it something that the end user must activate within their Reader?

No, it is a server product. Once the form is extended, you can distribute the form to Reader users and they do not need to activate anything extra. It also enables more extended features in Reader than the Usage Rights applied in Acrobat do.

Is it guaranteed that buying this product will make it work? Anyone who has tried it out? I can try the trail version. Btw, if i would download the trail version, what happens when the trail ends? Will the form become locked, or will the extensions just deactivate, or perhaps they extensions will stay but i cant set up new form with the extensions?

Yes, it is an enterprise application that has been around for several years.

> Anyone who has tried it out?

It is currently in active use by a large number of corporations from large governmental bodies on down.

> Btw, if i would download the trail version, what happens when the trail ends?

Nothing will happen with the forms already extended. You just won't be able to extend any more forms after the trial expires (this includes if you modify / update an already extended form, you will not be able to re-extend it).